Demagnetizing control method for double-feeding type wind power generation system to LVRT (Low Voltage Ride Through)

The invention provides a demagnetizing control method for a double-feeding type wind power generation system to LVRT (Low Voltage Ride Through). A converter on a rotor side is utilized to inject a rotor demagnetizing current component reverse to a stator direct current (space vector) into a rotor loop, so that the accelerating attenuation for a stator direct current magnetic chain is realized. During the control process, only a stator current amplitude value is detected and the stator magnetic chain need not be observed, so that the demagnetizing control method is free from dependence on system parameters. According to a simulated result, the demagnetizing control method provided by the invention is capable of effectively realizing the attenuation for the stator direct current magnetic chain, is free from dependence on the system parameters, and is stronger in robustness.